Microsoft Corp. on Tuesday announced the release of Service Pack 1 (SP1) for its Exchange 2003 messaging server, offering updates for e-mail security and administration.

Chief among the new features in this release is Microsoft Exchange Intelligent Message Filter (IMF) for Exchange Server 2003, which uses the SmartScreen heuristics-based content-filtering technology deployed at Microsoft Corp.'s MSN and Hotmail services as another tool to screen out spam messages based on content. IMF is designed to work in combination with other third-party anti-spam products.

Also on Tuesday, Microsoft took another step toward blocking spam by announcing the merging of its CallerID for E-mail proposal with the Sender Policy Framework (SPF) specification.

Both efforts are designed to make improvements in SMTP to prevent spammers from "spoofing" or forging legitimate e-mail addresses as the return addresses of their messages....

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